dart2js: use WorldImpact for dump_info

pkg/compiler/lib/src/common/codegen.dart

Index: pkg/compiler/lib/src/common/codegen.dart
diff --git a/pkg/compiler/lib/src/common/codegen.dart b/pkg/compiler/lib/src/common/codegen.dart
index 3029a124ae456a0d4858df26139a187d99b5697e..d08c41c27821365c12264a634545bedd2a1252cd 100644
--- a/pkg/compiler/lib/src/common/codegen.dart
+++ b/pkg/compiler/lib/src/common/codegen.dart
@@ -187,7 +187,6 @@ class CodegenRegistry extends Registry {
 
   void registerDynamicUse(DynamicUse dynamicUse) {
     worldImpact.registerDynamicUse(dynamicUse);
-    compiler.dumpInfoTask.elementUsesSelector(currentElement, dynamicUse);
   }
 
   void registerTypeUse(TypeUse typeUse) {
@@ -263,6 +262,8 @@ class CodegenWorkItem extends WorkItem {
     if (world.isProcessed(element)) return const WorldImpact();
 
     registry = new CodegenRegistry(compiler, element);
-    return compiler.codegen(this, world);
+    var impact = compiler.codegen(this, world);
+    world.impacts[element] = impact;
+    return impact;
   }
 }